Departments and specialties

Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery.

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Displaying 1-5 out of 5 doctors available

Last Name Initial: M

  1. Umair Majeed, M.B.B.S., M.D.

    Umair Majeed, M.B.B.S., M.D.

    1. Oncologist
    2. Hematologist
    1. Jacksonville, FL
    Areas of focus:

    Chemotherapy for colon cancer, Colon cancer, Liver cancer, Hepatocellular carcinoma, Pancreatic cancer, Rectal cancer, ...Stomach cancer, Cholangiocarcinoma, Esophageal cancer, Gallbladder cancer, Anal cancer, Stage 4 colorectal cancer

  2. Kellie L. Mathis, M.D.

    Kellie L. Mathis, M.D.

    1. General Surgeon
    2. Colon and Rectal Surgeon
    1. Rochester, MN
    Areas of focus:

    Anorectal surgery, Coloanal anastomosis, Colonoscopy, Laparoscopic surgery, Ileoanal anastomosis surgery, Flexible sigm...oidoscopy, Colostomy, Ileostomy surgery, Colorectal surgery, Robotic surgery, Rectal cancer surgery, Colon cancer surgery, Colectomy, Intraoperative radiation therapy, Rectal prolapse surgery, Proctectomy, Pelvic floor dysfunction, Colon cancer, Inflammatory bowel disease, Rectal cancer, Anorectal abnormality, Familial adenomatous polyposis, Ulcerative colitis, Diverticulitis, Constipation, Pouchitis, Colon polyps, Anal fissure, Rectal prolapse, Lynch syndrome, Fistula, Anal fistula, Vaginal fistula, Pelvic floor defecatory dysfunction, Anal cancer, Carcinoid tumor, Tubular colon adenoma, Polyposis syndromes, Hemorrhoids, Recurrent cancer, Polyp, Abscess

  3. Nicholas P. McKenna, M.D., M.S.

    Nicholas P. McKenna, M.D., M.S.

    1. Colon and Rectal Surgeon
    1. Rochester, MN
    Areas of focus:

    Anorectal surgery, Colonoscopy, Laparoscopic surgery, Ileoanal anastomosis surgery, Hemorrhoidectomy, Hemorrhoidal band...ing, Colostomy, Ileostomy surgery, Colorectal surgery, Robotic surgery, Rectal cancer surgery, Colon cancer surgery, Colectomy, Small bowel resection, Proctectomy, Bowel resection, Colon cancer, Inflammatory bowel disease, Rectal cancer, Familial adenomatous polyposis, Ulcerative colitis, Diverticulitis, Crohn's disease, Perianal abscess, Colon polyps, Anal fissure, Anal fistula, Anal cancer, Anal squamous cell carcinoma, Polyposis syndromes, Hemorrhoids

  4. Amit Merchea, M.D.

    Amit Merchea, M.D.

    1. Surgical Oncologist
    2. Colon and Rectal Surgeon
    1. Jacksonville, FL
    Areas of focus:

    Colostomy, Rectal cancer surgery, Colon cancer surgery, Chemotherapy for colon cancer, PIPAC, Colon cancer, Rectal canc...er, Ulcerative colitis, Crohn's disease, Anal fistula

  5. Nitin Mishra, M.B.B.S., M.P.H.

    Nitin Mishra, M.B.B.S., M.P.H.

    1. General Surgeon
    2. Colon and Rectal Surgeon
    1. Phoenix, AZ
    Areas of focus:

    Laparoscopic surgery, Colostomy, Colorectal surgery, Robotic surgery, Rectal cancer surgery, Colon cancer surgery, Intr...aoperative radiation therapy, Colon cancer, Inflammatory bowel disease, Rectal cancer, Rectal prolapse, Anal fistula

Research

Mayo Clinic doctors and scientists are studying new ways to diagnose and treat rectal cancer. Learn more about gastrointestinal cancer research.

Cancer research is conducted in coordination with Mayo Clinic Comprehensive Cancer Center. Mayo Clinic Comprehensive Cancer Center receives funding from the U.S. National Cancer Institute and is designated as a comprehensive cancer center. This designation recognizes the institution's scientific excellence and multidisciplinary resources focused on cancer prevention, diagnosis and treatment.

Publications

See a list of publications about rectal cancer by Mayo Clinic doctors on PubMed, a service of the National Library of Medicine.

Research Profiles

Sept. 12, 2025

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